Auto tire pump plunger



NOVI 4 1924.

H. SCHLOMER ET AL AUTO TIRE PUMP PLUNGER Filed Aug. 20. 1923 gn-veml' 015 Hera/ry Sek/hamer gcazald Patented 4, i924.

g incas E'r AOFF!'CiFi-l HENRY soHLoEiuER AEE HENRY E. scr-IULM, or sans CITY, wrsonsm.

Auro TIRE PUMP PLUNGEE.

Application filed August 20, ,1923. Serial No. 76,758,285.

To all whom t may concern.'

Be it known that we, HENRY SCHLOEMER and HENRY E. SGHULDT, both citizens of the United States, and residents of Sauk City, in the county of Sauk and State of TWisconsin, have invented certain new and useful Improvements in Auto Tire Pump Plungers; and we do hereby declare that the following is a full, clear, and exact description thereof.

Our invention relates to improvement-s in pneumatic pumps, such as those operated by hand, and is particularly directed to that class adapted for infiating automobile tires.

I-Ieretofore one disadvantage in pumps of this character has been due to the fact that the plunger does not at all times lie in contact with the wall of the pump barrel, thus permitting air to escape and not getting the full capacity of the pump when the same is in operation.

It is therefore the object of our invention to provide a pump the plunger of which is so constructed that passage of air there around is prevented.

In the accompanying drawings:

Figure 1 is a side elevation, partly in section, showing a pump having therein our improvement, and

Figure 2 is a perspective view of our improved plunger, with the iexible member removed therefrom.

Referring to the accompanying drawings in detail, wherein like reference numerals denote corresponding parts throughout the` several views, the numeral 1 designates a cylinder of the usual type used in pumps of this character, the same having secured to the lower end thereof a cap 2 provided with the usual foot engaging stirrup 3.

'Ihe cap portion 2 has provided therein a check valve 4 through which air is permitted to pass upon the upward movement of the plunger'. rIhe cap portion 2 has also connected thereto a flexible hose 5, the same communicating with a port 6, through which air is forced during the downward movement of the plunger.

In accordance with our invention our improved plunger consists of the usual plunger rod 7, the upper end of which has connected thereto a handle portion 8, while the lower end is threaded, as indicated at 9, and adapted to receive thereon a suitable piston.

As disclosed in the drawings our improved plunger or piston consists of a leather cupy I1() which isy adapted to fit snugly within the barrel of the pump, and uponthe lower end of the rod 7.

In order to hold the cup 10 securely upon the rod 7 we have provided upon the upper surface of the cup ak washer 11, which is limited in its upward movement by a nut 12, upon the threaded portion of the rod 7. l/Vthin the cup 10 we have provided a second washer 13, which is clamped securely upon the rod 7 by a nut 14. Thus it will be seen that the bottom portion of the cup 10 is securely clamped between the washers 11 and 13. l

In order that the skirt of the cup 10 may at all times be held in contact with the wall of the cylinder 1, we have provided a pair of arms 15 hingedly connected to the washer 13 at diametrically opposite points. The lower ends of the arms 15 have connected or made integral therewith semicircular members 16 which are adapted to engage approximately the entire inner circumference of the skirt 10.

To compensate for wear of the leather and at the same time insure positive contact of the leather with the inner wall of the cylinder 1 we have arranged between the arms 15 a helical spring 17, which is adapted to force the arms apart and cause the leather to engage the wall of the cylinder.

The spring 17 may be secured to the rod 7 and the arms 8 in any suitable manner provided however that the connection permits the spring to function as above stated.

Furthermore, while we have shown the lower washer 13 as being fitted over the rod 7 and held thereto by a nut 14 if desired the same may be threaded and adapted to screw upon the rod, thus eliminating the nut 14.

From the foregoing, it is thought that the construction, operation and many advantages of the herein described invention will be apparent to those skilled in the art, without further description, and it will be understood that various changes in the size, shape, proportion, and minor details of construction may be resorted to without departing from the spirit or sacrificing any of the advantages of the invention.

Having thus fully described our invention, what we claim as new and desire to secure by Letters Patent, is

1. A pump of the class described having a cylinder and a reciprocating element there-` in, a flexible cup clamped to said element,

arms 'pivoted to one of its clamping membersand extending downward Within the skirt of said cup, and a spring for forcing the arms apart and holding said skirt in ontact with the inner Wall of said cyliner. f

2. A pump of the class described having a cylinder and a reciprocating element therein7 a flexible cup clamped to said ele- 10 ment, aclamping member Within said cup,

arms pivotally connected to said clamping member, and a spring for forcing the arms apart and holding the cup in Contact with the inner Wall of said cylinder.

In testimony that We claim the foregoing We have hereunto set our hands at Saul; City, in the county of Sauk and State of Wisconsin.

HENRY SCHLOEMER. HENRY E. Y SCHULDT., 

